CARD15 gene polymorphisms in Serbian patients with Crohn's disease: genotype-phenotype analysis

Marijana B Protic1, Sonja T Pavlovic, Daniela Z Bojic

  • 1Center for Gastroenterology and Hepatology, University Clinical Center, Zvezdara, Belgrade, Serbia. marijanaprotic@beotel.yu

Insights

CARD15 mutations increase Crohn's disease (CD) risk in Serbian populations, particularly the L1007fs variant. These mutations are linked to earlier disease onset, ileal disease, and increased need for surgery.

Area of Science:

  • Genetics
  • Gastroenterology
  • Immunology

Background:

  • Crohn's disease (CD) genetic analysis is complicated by heterogeneity and incomplete penetrance.
  • CARD15 polymorphisms are associated with CD susceptibility in Western Europe, but population-specific frequencies exist.

Purpose of the Study:

  • To determine the prevalence of CARD15 mutations in a Serbian population.
  • To investigate the correlation between CARD15 mutations and CD phenotypes in this population.

Main Methods:

  • Genotyping of 131 CD patients, 65 ulcerative colitis patients, and 88 healthy controls for three common CARD15 mutations (R702W, G908R, Leu1007insC) using PCR-RFLP.
  • Statistical analysis using chi-squared and Student's t-tests.

Main Results:

  • CARD15 mutations were found in 35.11% of CD patients, significantly higher than in healthy controls (14.77%) and ulcerative colitis patients (7.69%).
  • The L1007fs mutation showed a strong association with CD (P<0.0001).
  • CARD15 carriers had increased risk for isolated ileal location (OR 2.30), fibrostenotic behavior (OR 9.86), surgical resection (OR 2.2), and earlier disease onset.

Conclusions:

  • CARD15 mutations, particularly L1007fs, are associated with an increased risk of Crohn's disease in central Europeans.
  • These mutations correlate with earlier onset, ileal and fibrostenotic disease, and a higher likelihood of requiring surgery.
  • No east-west divide in genotype frequency or CD phenotype within Europe was observed, suggesting latitude may not be a primary factor.
Abstract

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